This problem is caused by the new 06-move_data_out_of_jar.patch. It
moves things from inside the jar to /usr/share/josm, and changes the
code to match. But in most cases the relevant paths are stored in user
preference files, which means the code changes only affect the
*defaults* stored in preferences, which means only new users will get
the correct paths. Existing users who already have resource:// URLs
stored in preferences.xml will keep them, but they don't work anymore.
As a *workaround*, you can manually replace resource:// with
/usr/share/josm/ everywhere in ~/.josm/preferences.xml.
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